[Top] [All Lists]

Topband: Modification to INRAD Roofing Filter

Subject: Topband: Modification to INRAD Roofing Filter
From: Dennis W0JX <>
Date: Sat, 20 Oct 2007 11:53:41 -0700 (PDT)
List-post: <>
Those of you who have the INRAD Roofing Filter Kit in your 1000MP's might be 
interested in the following modification to improve the IMD numbers reported by 
  The mod was developed by Mike, W2AJI. It apparently reduces the gain a little 
in the roofing filter 2 stage amplifier. 
  I have not yet tried the modification but it looks simple, involving the 
change of only two resistors.
  I also believe, as does Mike, that the filter is actually a little wider than 
the specifications state. I have no trouble copying AM stations on my main rx. 
The filter kit I have is my second one due to a failure of the filter in my 
first kit purchased two years ago. The bandwidth of the first kit seemed a bit 
tighter than the one I presently have but it is still an
  improvement over the stock radio.
  73, Dennis W0JX/8
  Milan, OH

Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
Topband mailing list

<Prev in Thread] Current Thread [Next in Thread>